There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the n_tty_receive_buf_common function in drivers/tty/n_tty.c.
lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
bugzilla.kernel.org/show_bug.cgi?id=206361
lists.debian.org/debian-lts-announce/2020/06/msg00011.html
lists.debian.org/debian-lts-announce/2020/06/msg00012.html
lists.debian.org/debian-lts-announce/2020/06/msg00013.html
security.netapp.com/advisory/ntap-20200924-0004/
usn.ubuntu.com/4342-1/
usn.ubuntu.com/4344-1/
usn.ubuntu.com/4345-1/
usn.ubuntu.com/4346-1/
www.debian.org/security/2020/dsa-4698